How does Hongmi's storage work?

Forgive me if I seem dense, but I've never had a phone with multiple storage locations so I'm confused. The Hongmi has three: an external sdcard, an internal storage, and another internal storage. On my old phone there was only internal and external. The internal card was used by the system and programs, and the external card kept all the data. So, if I install an application, the software goes on the internal drive and the settings and data go on the external card. Easy.

I tried installing...

How does Hongmi's storage work?